Northbrook, IL Weather & Climate Normals
What a normal year in Northbrook actually looks like
On the 30-year record NOAA keeps for Northbrook, IL, the comfort score comes out to 44/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Northbrook's weather actually swings
Average temperatures in Northbrook run from 24°F in Jan up to 74°F in Jul, a 49.2°F seasonal swing, one of the widest gaps in this dataset.
How wet Northbrook actually gets
Over a typical year, Northbrook sees about 39.51in of precipitation a year across roughly 130 days with measurable rain or snow, with 33.6in of snow a year.
Northbrook against the rest of the country
Out of 4876 cities scored here, Northbrook comes in at 3715; within IL alone it ranks 175 of 330. Population is about 34,546.
Checking the actual forecast
These figures come from CHICAGO BOTANIC GARDEN, IL US, the NOAA station 2.7 miles from Northbrook, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated